▲關于不定式作表語的深層分析：

該結構說明“不定式是主語的內容或解釋”。這種結構的實質是：be是系動詞，be前的主語和be后的表語是同位概念，不定式是主語的內容和解釋，主語往往表示“目的，目標，想法，愿望，愛好，工作，責任，方法”之類的名詞。

因為它們是“主語和表語”的關系，是對等的關系，所以，主語和不定式的位置可以顛倒，而意思保持不變，例如：

A salesman's job is to seek out customers.  推銷員的工作是尋求顧客。

Her purpose in learning is to be a doctor. 她學習的目的是當醫生。

My only hope is to use her notes.  我唯一的希望是用她的筆記。

His dream is to become an engineer. 他的夢想是將來成為一名工程師。

The trick is to hold your breath while you aim.  竅門就在于瞄準時須屏住呼吸。

Our goal is to achieve the maximum of efficiency.  我們的目標是取得最高的效率。

The purpose of a trap is to catch and hold animals. 陷阱是用來捕捉野獸的。

His target is to save $100 a week. 他的目標是每周儲蓄一百元。

The only way to do that is to reduce expenses.  做到這一點的唯一辦法是減少開支。

His sole motive is to make more money. 他唯一的動機就是多賺錢。

Our only resort is to inform the police.  我們唯一的辦法就是向警方報案。

His hobby is to observe things with his telescope.  他的嗜好就是用望遠鏡觀察東西。

His ambition is to fly to the moon one day. 他的愿望是有一天登上月球。

Our aim is to make books available to all. 我們的目的是使大家都能看得到書。

My chief end is to serve my country and my people.  我的首要目標是為國為民服務。

Her wish is to go abroad for advanced study. 她的心愿是到國外進修。

One of my duties is to file the letters.  我的職責之一是將信件歸檔。

Our thought is to avoid war. 我們的意向是避免戰爭。

My idea is to climb the mountain from the north. 我的想法是從北面登上這座山。

What Tom wants is to do his field work.  湯姆想的是作他的野外實習。

The new manager's job is to restore the company to profitability.  新經理的工作是讓這家公司能恢復盈利狀況。

Her work is to look after the children. 她的工作是照顧這些孩子。

My aim is to start up my own company. 我的目標是開辦一家我自己的公司。

His ambition was to meet his favourite pop star face to face. 他的心愿是，要面對面地見到他所喜愛的流行歌星。

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